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Network Working Group W A Simpson
Internet Draft Daydreamer
expires in six months March 1993
PPP over SONET
Status of this Memo
This memo is the product of the Point-to-Point Protocol Working Group
of the Internet Engineering Task Force (IETF). Comments on this memo
should be submitted to the ietf-ppp@ucdavis.edu mailing list.
Distribution of this memo is unlimited.
This document is an Internet Draft. Internet Drafts are working
documents of the Internet Engineering Task Force (IETF), its Areas,
and its Working Groups. Note that other groups may also distribute
working documents as Internet Drafts. Internet Drafts are draft
documents valid for a maximum of six months. Internet Drafts may be
updated, replaced, or obsoleted by other documents at any time. It
is not appropriate to use Internet Drafts as reference material or to
cite them other than as a ``working draft'' or ``work in progress.''
Please check the 1id-abstracts.txt listing contained in the
internet-drafts Shadow Directories on nic.ddn.mil, nnsc.nsf.net,
nic.nordu.net, ftp.nisc.sri.com, or munnari.oz.au to learn the
current status of any Internet Draft.
Abstract
The Point-to-Point Protocol (PPP) [1] provides a standard method of
encapsulating Network Layer protocol information over point-to-point
links.
This document defines a method for using PPP to transport multi-
protocol datagrams over SONET circuits.
Simpson expires in six months [Page i]
DRAFT PPP over SONET March 1993
1. Introduction
PPP has three main components:
1. A method for encapsulating datagrams over serial links.
2. A Link Control Protocol (LCP) for establishing, configuring,
and testing the data link connection.
3. A family of Network Control Protocols (NCPs) for establishing
and configuring different network layer protocols.
PPP was designed as a standard method of communicating over point-
to-point links. Initial deployment has been over short local lines,
leased lines, and plain-old-telephone-service (POTS) using modems.
As new packet services and higher speed lines are introduced, PPP is
easily deployed in these environments as well.
One protocol to carry them all.
One protocol to mind them.
One protocol to link them all,
and in the network bind them.
This specification is primarily concerned with the use of standard
PPP frames over SONET links. Since SONET is a point-to-point
circuit, PPP is well suited to use over SONET.
2. Encapsulation
PPP provides an encapsulation protocol over both bit-oriented
synchronous links and asynchronous links with 8 bits of data and no
parity. These links MUST be full-duplex, but MAY be either dedicated
or circuit-switched. This fits the SONET model, which looks like an
asynchronous link to the link-layer encapsulation.
PPP uses HDLC [2] as a basis for the encapsulation. It is completely
suitable for use with the SONET link. It is distinguishable from
other uses of the SONET link, such as Asynchronous Transfer Mode
(ATM).
3. Configuration Details
The standard LCP configuration defaults apply to SONET links.
The following Configurations Options are recommended:
Simpson expires in six months [Page 1]
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Magic Number
Link Quality Monitoring
No Address and Control Field Compression
No Protocol Field Compression
Since the SONET link is treated as an asynchronous link, the Flag and
Escape values MUST be escaped. However, the default ACCM for SONET
is 0 (no control octets escaped).
Simpson expires in six months [Page 2]
DRAFT PPP over SONET March 1993
Security Considerations
Security issues are not discussed in this memo.
References
[1] Simpson, W. A., "The Point-to-Point Protocol", RFC 1331, May
1992.
[2] International Organization For Standardization, ISO Standard
3309-1979, "Data communication - High-level data link control
procedures - Frame structure", 1979.
Acknowledgments
Chair's Address
The working group can be contacted via the current chair:
Brian Lloyd
B.P. Lloyd & Associates
3420 Sudbury Road
Cameron Park, California 95682
Phone: (916) 676-1147
EMail: brian@lloyd.com
Author's Address
Questions about this memo can also be directed to:
William Allen Simpson
Daydreamer
Computer Systems Consulting Services
P O Box 6205
East Lansing, MI 48826-6205
EMail: Bill.Simpson@um.cc.umich.edu
Simpson expires in six months [Page 3]
DRAFT PPP over SONET March 1993
Table of Contents
1. Introduction .......................................... 1
2. Encapsulation ......................................... 1
3. Configuration Details ................................. 1
SECURITY CONSIDERATIONS ...................................... 3
REFERENCES ................................................... 3
ACKNOWLEDGEMENTS ............................................. 3
CHAIR'S ADDRESS .............................................. 3
AUTHOR'S ADDRESS ............................................. 3
Bill.Simpson@um.cc.umich.edu